In an antagonistic interview with The Sun, the USA president lashed out at Sadiq Khan, accusing him of doing a "terrible" job, claimed Boris Johnson would make a great Prime Minister and made it clear he was very aware of the giant inflatable Trump baby due to fly above Parliament today - and would be avoiding London.

May has been making the case for a United States free trade deal with Trump, on his first United Kingdom visit as president.

Trump, sat next to May at her official country residence at Chequers on Friday, said we "really have a very good relationship", and would discuss trade, the military and other matters over lunch.

Responding to Mr Trump's comments about The Sun, a spokesman for the newspaper said: "We stand by our reporting and the quotes we used - including those where the president was positive about the prime minister, in both the paper and in our audio - and we're delighted that the president essentially retracted his original charge against the paper later in the press conference".

"We've got a lot to discuss", May said, adding they would talk about the British-U.S. One protest group has been given permission for a balloon in the president's image, shaded in orange and dressed in a diaper, known as the "Trump Baby Blimp", to hover over Parliament Square Garden.

She maintained the government's Brexit agreement "delivers" on the referendum vote.

As for Johnson, Trump said: "I think he would be a great prime minister".

Mr Khan said however he planned on being the "bigger man" over the feud and not rise to taunts by Trump.

Seated alongside the Prime Minister, Mr Trump appeared ready to adopt a more conciliatory tone as he sat down for talks at Chequers in Buckinghamshire.

"I think allowing millions and millions of people to come into Europe is very, very sad".

He added that he supported the resignations of Mr Davis and Mr Johnson, and said the Tories were telling businesses that "the rules that have burdened you for year are not going to go anywhere". "We want to make sure he knows that all of Britain is looking down on him and laughing at him".

Trump also spoke on immigration policy in the interview, saying that Europe was losing its identity and culture because of an influx of migrants.

After a North Atlantic Treaty Organisation summit where he provoked a crisis session to force allies to raise their defence spending, Trump landed in Britain having described the closest USA ally in Europe as being in turmoil over Brexit.

Trump is meeting May for a working lunch before meeting the Queen for tea and a likely round at his Scottish golf course.

Trump told The Sun that conducted the interview while he was in Brussels for the North Atlantic Treaty Organisation (NATO) summit, that UK's blueprint for its post-Brexit relations with the European Union was "a much different deal than the people voted on".

On Thursday night, several protesters gathered outside Winfield House, where Trump is staying, banging pots and blowing vuvuzelas in the hopes of keeping him awake.

Protesters gathered in central London to denounce the visit for stoking "division along fault lines of fear and hatred".